SFSU Public Affairs Press ReleasePublished by the Public Affairs Office at San Francisco State University, Diag Center. |
1. TAKING ARSENIC OUT OF DRINKING WATER, NATURALLY
With higher levels of arsenic showing up in groundwater and drinking water, scientists and natural resource agencies are scrambling for new ways to remediate this toxic problem. Like integrated pest management, which uses naturally occurring organisms to control pests in agriculture, some researchers are turning to nature to combat arsenic.
In a presentation scheduled for Tuesday at 2:45 p.m., SF State chemistry professor Dr. Bruce Manning, et al, will discuss ongoing research that employs naturally occurring minerals like iron and manganese oxides, and "engineered" materials such as zero-valent iron, to extract arsenic from water. While iron metal itself does not bind arsenic, the iron oxide corrosion product has a high arsenic binding capacity. Applications include creating "reactive barriers," like sand mixtures, that are heavily laced with reactive metal oxide materials. The sand functions like a sieve, or filter. When contaminated water passes through, the arsenic is left behind.
Of his new findings, Manning says, "We're starting to understand how to take advantage of the natural tendencies metal oxide-based materials have to immobilize pollutants such as arsenic. In addition, we're trying to control the redox state of arsenic to keep it in the most immobile, and least toxic form."
Presentation Title: EXAFS Analysis of As(III) and As(V) Reactions with Fe and Mn Oxides.
Abstract No: H22F-05; Author Contact: bmanning@sfsu.edu; (415) 338-1292
Date/Time/Location: Tuesday, 2:45 p.m., MC 302
2. OCEAN PRODUCTIVITY AND RELEASE OF CO2 TO THE ATMOSPHERE
The equatorial Pacific upwelling ecosystem is known to be low in silicate, relative to nitrate, and to be a major source of CO2 release into the atmosphere. Phytoplankton like diatoms feed on inorganic carbon, preventing it from "upwelling" to the atmosphere, but carbon consumption depends on how much silicic acid the water contains-the more silicic acid, the more carbon these tiny marine algae consume.
SF State biological oceanographer Dick Dugdale, et al, has been studying silicic acid levels in the equatorial Pacific, finding great discrepancies among areas. Dugdale and colleagues will present research on Monday at 4:05 p.m. showing the complex interaction of upwelling systems throughout the equatorial Pacific, its impact on silicic acid distribution, and the subsequent effect on carbon release into the atmosphere.
Presentation Title: Sources of Silicate and Nitrate to the Pacific Equatorial Upwelling System and Effects on Ocean/Atmosphere CO2 Flux
Abstract No : OS12E-10; Author Contact: rdugdale@sfsu.edu; (415) 338-3518
Date/Time/Location: Monday, 4:05 p.m., MC-104
Other posters/presentations, by date, include:
Poster Title: Effect of Temperature and Salinity Gradients on Ultrasonic Velocity Meter Measurements
Authors: Bland, RW, Physics and Astronomy Dept., SF State; Simpson, M R., US Geological Survey; Abraham, J., Physics and Astronomy Dept., SF State.
Contact Information: bland@stars.sfsu.edu
Abstract No: H52A-23
Date/Time/Location: Friday, 1:30 p.m., McHall D
Presentation Title: Planetary Climate Change," A Geosciences Course for Pre-Service Secondary Science Teachers (and others)
Authors: Dempsey, D, SF State Dept. of Geosciences; O'Sullivan, K, SF State Dept. of Secondary Education; Grove, K., SF State Dept. of Geosciences; White, L., SF State Dept. of Geosciences; Schultz, G., UC Berkeley Center for Science Education; Dutton, D., SF State Dept. of Geosciences.
Contact Information:
Abstract No: PA61A-09
Date/Time/Location: Saturday, 11:25 a.m., MC 121
Poster Title: Ship-based Observations of Wind-Driven Oceanographic Variability Over the Shelf near Bodega Bay, California During June 2000
Authors: Garfield, N., SF State Dept. of Geosciences/Romberg Tiburon Center for Environmental Studies; Largier, J., Scripps Institution of Oceanography, UC San Diego.
Contact Information: garfield@sfsu.edu
Abstract No: OS72B-08
Date/Time/Location: Sunday, 1:30 p.m., McHall D
Poster Title: Wind-Driven Experiment of Shelf Transport (WEST): The Role of Wind-Driven Transport in Shelf Hydrography, Nutrients and Chlorophyll off Bodega Bay, CA
Authors: Wilkerson, Dugdale, Garfield, Marchi, Hogue, SF State's Romberg Tiburon Center for Environmental Studies; Largier, J., Scripps Inst. of Oceanography, UC San Diego; Kudela, R., Ocean Sciences Dept., UC San Diego.
Contact Information: fwilkers@sfsu.edu
Abstract No: OS72B-09
Date/Time/Location: Sunday, 1:30 p.m., McHall D
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